You cant sacrifice your opponents stuff
[casthaven]Ultimate Price[/casthaven] also can deal with [casthaven]Jace, Vryns Prodigy[/casthaven], [casthaven]Tasigur, the Golden Fang[/casthaven], [casthaven]Warden of the First Tree[/casthaven], and man other annoying creatures
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Fourteen cards is a lot to get into your graveyard, though there are quite a few good ways to fill your graveyard, so it seems possible
Tyranid Swarm Just like their 40k counterparts, the Tyranid cards are big and stompy
I know 21 commander damage got decided on due to the original cycle of Elder Dragons having 7 power and you getting hit three times equaled 21 but the book quote is just so fitting for our format